Partial indium solubility induces chemical stability and colossal thermoelectric figure of merit in Cu<sub>2</sub>Se

Olvera, Alan; Moroz, Nicholas A.; Sahoo, Pranati; Ren, Ping; Bailey, Trevor P.; Page, Alexander; Uher, Ctirad; Poudeu, Pierre F. P.

doi:10.1039/c7ee01193h

Cited by 304 publications

(227 citation statements)

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“…Both Zhao et al and Liu et al have reported the peak zT value of SnSe can be higher than 2 when the temperature is above 800 K. Meanwhile, most other results suggest the peak zT values of SnSe are at the temperature range lower than 800 K . When the temperature is between ≈800 and ≈1000 K, Cu 2 X, PbX (X = Te, Se, and S), SnTe as well as low‐cost and stable BiCuSeO are more attractive. Through nonequilibrium processing, Tan et al have achieved a record‐high zT value of 2.5 in Pb 0.98 Na 0.02 Te‐8%SrTe at 923 K. As a potential substitution for highly toxic PbTe, peak zT values of SnTe of ≈1.5 have also been widely reported .…”

Section: Introductionmentioning

confidence: 98%

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

et al. 2020

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Due to the nature of their liquid‐like behavior and high dimensionless figure of merit, Cu2X (X = Te, Se, and S)‐based thermoelectric materials have attracted extensive attention. The superionicity and Cu disorder at the high temperature can dramatically affect the electronic structure of Cu2X and in turn result in temperature‐dependent carrier‐transport properties. Here, the effective strategies in enhancing the thermoelectric performance of Cu2X‐based thermoelectric materials are summarized, in which the proper optimization of carrier concentration and minimization of the lattice thermal conductivity are the main focus. Then, the stabilities, mechanical properties, and module assembly of Cu2X‐based thermoelectric materials are investigated. Finally, the future directions for further improving the energy conversion efficiency of Cu2X‐based thermoelectric materials are highlighted.

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Section: Introductionmentioning

confidence: 98%

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

et al. 2020

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“…Due to the high-degree homogeneously dispersed molecular CNTs inside the Cu 2 Se matrix, a zT of 2.4 at 1,000 K has been achieved. Olvera et al [22] reported a record zT of 2.6 at 850 K in Cu 2 Se-CuInSe 2 composites. It was suggested that the incorporation of a small fraction of In into the Cu 2 Se lattice induced partial localization of Cu + ions, and a hybrid structure with same Se lattice was formed.…”

Section: Liquid-like or Superionic Materialsmentioning

confidence: 99%

“…3a, Cu 2 Se possesses two sublattices: the rigid FCC framework of Se atoms and the disordered and flowing sublattice of Cu. At high temperatures, Cu ions migrate from one site (interstitial one formed by Se) to another, exhibiting a flowing character that is Figure 1 Timeline of zT for selected Cu-based superionic conductors [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27] (red), tetragonal [28][29][30][31][32][33][34][35][36][37] (blue) and distorted [38][39][40][41][42][43][44][45][46][47][48][49] (green) diamond-like materials and BiCuSeO oxyselenides (purple) [50][51][52][53][54][55][56][57][58][59]…”

Section: Decoupled Transport Properties By Two Independent Sublatticesmentioning

confidence: 99%

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Copper chalcogenide thermoelectric materials

et al. 2018

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Cu-based chalcogenides have received increasing attention as promising thermoelectric materials due to their high efficiency, tunable transport properties, high elemental abundance and low toxicity. In this review, we summarize the recent research progress on this large family compounds covering diamond-like chalcogenides and liquid-like Cu 2 X (X=S, Se, Te) binary compounds as well as their multinary derivatives. These materials have the general features of two sublattices to decouple electron and phonon transport properties. On the one hand, the complex crystal structure and the disordered or even liquid-like sublattice bring about an intrinsically low lattice thermal conductivity. On the other hand, the rigid sublattice constitutes the charge-transport network, maintaining a decent electrical performance. For specific material systems, we demonstrate their unique structural features and outline the structure-performance correlation. Various design strategies including doping, alloying, band engineering and nanostructure architecture, covering nearly all the material scale, are also presented. Finally, the potential of the application of Cu-based chalcogenides as high-performance thermoelectric materials is briefly discussed from material design to device development.

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“…(ZT values of 1.7-1.9 for Cu 2−x S [12][13][14][15][16][17][18], 1.3-2.1 for Cu 2−x Se [14][15][16][17], and 0.3-1.1 for Cu 2−x Te [18][19][20]). Chemical doping has been widely adopted to tune the carrier concentration and improve the ZT of thermoelectric materials [21][22][23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Na-Doping Effects on Thermoelectric Properties of Cu2−xSe Nanoplates

Yu¹,

Han²,

Kim

2017

Applied Sciences

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For this work, a β-phase Cu 2−x Se nanowire and nanoplate, and a Na-doped Cu 2−x Se nanoplate were successfully synthesized using solution syntheses. The morphologies of the Cu 2−x Se nanowire and nanoplate could be easily controlled by changing the synthetic condition. The Na-doped Cu 2−x Se nanoplate was prepared by a simple treatment of the Cu 2−x Se nanoplate with a sodium hydroxide-ethylene glycol solution. The nanopowders were then consolidated to bulk materials using spark plasma sintering (SPS). The phase structure and the microstructure of all of the samples were checked using X-ray diffraction (XRD), high-resolution transmission electron microscope (HR-TEM), and scanning electron microscope (SEM) analyses. The thermoelectric transport properties, such as the electrical conductivity, Seebeck coefficient, carrier concentration, carrier mobility, and thermal conductivity, were measured at temperature ranges from 323 to 673 K. The results show that Na played two important roles: one is reducing the carrier concentration, thereby improving the Seebeck coefficient, the other is reducing the thermal conductivity. Overall, the maximum thermoelectric figure of merit (ZT) of 0.24 was achieved at 673 K in the Na-doped Cu 2−x Se nanoplate.

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Partial indium solubility induces chemical stability and colossal thermoelectric figure of merit in Cu₂Se

Abstract: Thermoelectric figure of merit, ZT, exceeding 2.6 at 850 K and copper electromigration inhibition have been demonstrated in indium modified Cu2Se.

Cited by 304 publications

References 43 publications

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

Copper chalcogenide thermoelectric materials

Na-Doping Effects on Thermoelectric Properties of Cu2−xSe Nanoplates

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Partial indium solubility induces chemical stability and colossal thermoelectric figure of merit in Cu2Se

Abstract: Thermoelectric figure of merit, ZT, exceeding 2.6 at 850 K and copper electromigration inhibition have been demonstrated in indium modified Cu2Se.

Cited by 304 publications

References 43 publications

Promising and Eco‐Friendly Cu2X‐Based Thermoelectric Materials: Progress and Applications

Promising and Eco‐Friendly Cu2X‐Based Thermoelectric Materials: Progress and Applications

Copper chalcogenide thermoelectric materials

Na-Doping Effects on Thermoelectric Properties of Cu2−xSe Nanoplates

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Product

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Partial indium solubility induces chemical stability and colossal thermoelectric figure of merit in Cu₂Se

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications

Promising and Eco‐Friendly Cu₂X‐Based Thermoelectric Materials: Progress and Applications